Eraser



c. BREWER I 2,406,487

ERASER Filed Aug. 16, 1945 Aug. 27, 1946.

Patented Aug. 27, 1946 .UNITED STATES; PATENT OFFICE ERAsEa- Charles A. Brewer, Noroton Heights, Conn. Application August 16, 1943, Serial No. 498,825

This invention relates to improvements in erasers as generally used for erasing writing, drawing, typewritingand similar uses.

7 This invention has for its principal objectto take away the particles from the erased surface while it is being erased.

Another object is to utilize the power or force used in operating the eraser to also. act to remove the particles from the surface being erased.

' Another object is to prevent undue injury to the. surface on which the erasures are being made. I

Another object is to dispose of the particles or dirt caused by the erasing to a suitable receptacle.

Other objects will be understood from the following description.

In the drawing:

Figure 1 is a partial longitudinal vertical section of the preferred form of the invention having one of the halves of the eraser housing removed.

81Claims. (c1. izo -sc) I2 prevent escape of the erasures and dirt particles and'allow the air pressure to escape through hole 21, screen I2 and vents I8 to the atmosphere.

Receptacle I0 is made of transparent material which serves to indicate when the receptacle requires emptying. Emptying is readily accomplished by pulling upward on cover gripping receptacle It. This will separate these parts, allowing removal of baffle plate II and screenIZ which may then be cleaned and the receptacle emptied and the parts I I and I2 placed in position and the two part Ill and I3 secured together by fasteners I4. An insert I9 of rubber or similar material is secured to the base at Ill.

The circular eraser when worn out is readily removable for replacement by releasing the latch Figure 2 is a section taken on line A.B. of Figure 1.

Figure 3 shows a latch for securing assembly of the eraser 3 as shown in Figure 2.

Figure 4 is a longitudinal vertical section of a modified form of my invention.

In the embodiment of my invention, as illustrated in the accompanying drawing, 3 is a circular shaped eraser, 4 a suction fan, 5 eraser housing, 6 an electric motor, I an electric circuit control switch for motor 6, 8 electric cord to a source of electric current, 9 flexible conduit, I0 transparent receptacle for deposit of erasure particles, II removable baflle plate, I2 removable screen, I3 is a cover for receptacle ID, at I4 is shown one of the three fasteners for detachably securing cover l3 to receptacle I0, Figure 1.

The operation of the eraser shown in Figure 1 is as follows: The lever of the electric switch I is moved to the position shown by dotted lines in Figure 1. This closes the electric circuit and places the motor in operation, suction fan 4 being secured to the motor shaft revolves thereby generating a suction in passage I6, flexible tube 9 and passage 20. This suction acts on circular eraser 3 and vanes ZI causing the circular eraser 3 to revolve in the direction indicated by the arrow in Figure 1. While the eraser is being applied to erase, particles are drawn in by suction into passage 20 through flexible tube 9 and passage I6 through suction fan 4 and forced by air pressure from fan 4 through passage II into receptacle chamber 23. A baflle plate I I and screen 25 which will allow pin 26 to be removed and the eraser housing 5 separated in halves and the eraser can be removed.

In the form shown in Figure l excessive erasure or damage to surface while being erased is prevented by the use of suction as the means for revolving the eraser. Any excessive manual pressure on the eraser while erasing will automatically slow down the speed at which the eraser will revolve. This is accomplished by proportioning the vanes 2| which will limit the power delivered to the circular eraser 3; this provides a Slip drive between the motor 6 (or source of power) and the eraser 3.

While it is believed from the foregoing description the nature and advantages of my'invention will be readily understood, I do not limit myself to what is herein shown and described and the right is herein reserved to make such changes as properly fall within the scope and spirit of my invention.

I claim:

1. An eraser comprising a housing and mounted therein a circular shaped revolvable eraser, conduit connection to said housing, one end of said conduit tangentially positioned to the perimeter of said revolvable eraser, the other end of said conduit connected to the suction inlet of a motor driven suction fan, a discharge utlet from said suction fan having a passage ending in a dirt receptacle having a bafile and a screen interposed between the receptacle chamber and outlets to the atmosphere.

,2. An eraser comprising a circular shaped eraser mounted in a housing and free to rotate, a passage leading from the interior of said housing, a conduit connected to said housing having its opening leading into said passage, a motor I 3 While driven suction fan having its suction passage joining the opening of the other end of saidcon duit, a, discharge passage leading from said suction fan to the interior of a, receptacle, baflie plate and screen in said receptacle, air vents leading from inside of said receptacle above said baffle and screen to the atmosphere and a removable cover on said receptacle and providing a housing for said suction fan, for operating saidi suction fan.

3. An eraser comprising a housing; a circular revolvable abrasive member mounted therein; suction-operated means connected to said abrasive member to rotate the same; a motor-driven suction fan; a conduit connected'to said'housing, one end of said conduit being tangentially positioned to the perimeter of the revolvable abrasive member and also positioned to connect the suction-operated means: to said motor-driven suction fan; and a. dirt receptacle connected to the discharge outlet, of said suction fan.

, 4. An eraser comprising. a housing having mounted therein a movable abrasive member; suctioneoperated means connected to said member to move the same to cause an erasure and. a conduit connected to a sourcerof suction and so positioned as to cause said suction-operated means to be operated. and drive said abrasive. member, said conduit also opening adjacent said, abrasive member and removing particlesv result.- ing from the operation, of said abrasive member.v

its passages, and; the motor 5. An eraser provided with a rotary erasing member; a suction-operated turbine connected thereto to rotate the same; and means for supplying suction to said turbine, said suction also removing the erased particles resulting from an erasure by said rotary erasing member.

6. An eraser having a source of suction and a suction-operated movable means, and an erasing member connected to said movable means to be moved thereby to produce an. erasure, the suction also acting to remove the erased particles resulting from the erasure by said movable erasing a member.

7. An eraser having a movable abrasive member; a power source; and means including a fluid driving medium, for connecting the eraser to said power source to be driven thereby, said drive yielding: when the abrasive member is overloaded to prevent damage to the material being erased.

8. An abrading device including a. housing having, mounted therein a movable abrasive, member; suction-operated driving means for said member to. move the. same to cause. an abrasion; and a conduit connected to a source of suction and arranged to cause said suction-operated driving means, to be operated and drive said abrasive member, and to provide a suction means adja-. cent said abrasive member for picking, up. particles resulting from the operation. of said abrasive member. s

CHARLES A. BREWER.v 

